1821270772 has 12 divisors (see below), whose sum is σ = 3187529856. Its totient is φ = 910547960.

The previous prime is 1821270767. The next prime is 1821270797. The reversal of 1821270772 is 2770721281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55197 + ... + 81787.

It is an arithmetic number, because the mean of its divisors is an integer number (265627488).

Almost surely, 2^1821270772 is an apocalyptic number.

It is an amenable number.

1821270772 is a deficient number, since it is larger than the sum of its proper divisors (1366259084).

1821270772 is a wasteful number, since it uses less digits than its factorization.

1821270772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43718 (or 43716 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 37.

The square root of 1821270772 is about 42676.3490940825. The cubic root of 1821270772 is about 1221.2132452803.

The spelling of 1821270772 in words is "one billion, eight hundred twenty-one million, two hundred seventy thousand, seven hundred seventy-two".